CN109187194A - A kind of soil body tensioning mechanical characteristic fiber-optic monitoring based on OFDR and test method and device - Google Patents
A kind of soil body tensioning mechanical characteristic fiber-optic monitoring based on OFDR and test method and device Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 93
- 238000012544 monitoring process Methods 0.000 title claims abstract description 39
- 238000002168 optical frequency-domain reflectometry Methods 0.000 title claims abstract 20
- 238000010998 test method Methods 0.000 title abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 61
- 239000013307 optical fiber Substances 0.000 claims abstract description 60
- 238000012545 processing Methods 0.000 claims abstract description 50
- 238000006073 displacement reaction Methods 0.000 claims abstract description 11
- 238000013001 point bending Methods 0.000 claims abstract description 11
- 238000009826 distribution Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 33
- 238000005516 engineering process Methods 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 12
- 238000000917 particle-image velocimetry Methods 0.000 claims description 11
- 238000004458 analytical method Methods 0.000 claims description 9
- 238000005336 cracking Methods 0.000 claims description 7
- 230000001427 coherent effect Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 5
- 238000007605 air drying Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
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- 238000004364 calculation method Methods 0.000 claims description 2
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- HPNSNYBUADCFDR-UHFFFAOYSA-N chromafenozide Chemical compound CC1=CC(C)=CC(C(=O)N(NC(=O)C=2C(=C3CCCOC3=CC=2)C)C(C)(C)C)=C1 HPNSNYBUADCFDR-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The soil body tensioning mechanical characteristic fiber-optic monitoring and test method and device that the present invention relates to a kind of based on OFDR, the straining and sensing optical fiber are horizontally layed in Tu Liangzhong；The tester is mainly made of counter-force bracket, loading system, the demodulation of OFDR signal with processing module, digital image acquisition and analytical equipment, the demodulation of OFDR signal is connect with processing module with the straining and sensing optical fiber in native beam, the Strain Distribution data inside native beam are acquired in real time, show light wave amount and native beam strength etc., the change in location of digital image acquisition and the analytical equipment tracking surface Tu Liang, it obtains the deformed strain field of native beam stress and displacement field and optical fiber data measured is checked mutually.The temporal and spatial evolution of the craze and transfiguration information and tension and compression strain of the surface Tu Liang and inside during energy real-time monitoring four-point bending test of the present invention, the tensile strength of the soil body under the conditions of measurement different water cut, dry density etc., plastic-elastic stress-strain constitutive relation after grasping soil body tension.
Description
Technical field
The present invention relates to Rock And Soil stress deformation, strength test technology and distributed optical fiber sensing field of engineering technology,
More particularly to a kind of soil body tensioning mechanical characteristic fiber-optic monitoring based on OFDR and test method and device.
Background technique
Tensioning mechanical characteristic is one of basic mechanical property of rock soil medium, Rock And Soil deformation with destruction during from
Very important effect, thus also produce many associated geotechnical engineering problems.The tensile strength and resistance to compression of the soil body
The indexs such as intensity, shearing strength are the same, are all the important parameters for measuring its mechanical property.The soil body in forming process, protolith
Integrality, globality show as also having certain compression strength, shearing resistance strong by different degrees of destruction in mechanical property
Degree, but intensity value has substantially reduced, and tensile strength is then most of or almost loses.
In previous engineering practice, the resistance to compression or shearing strength for being based primarily upon the soil body measure its mechanical property or in lotuses
Survivability under carrying, because tensile strength is numerically much smaller compared with resistance to compression, shearing strength, and is difficult to standard
It really measures, is typically chosen in engineering and ignores this intensity index.It is this ignorance in most cases show as 0 matric suction and
0 tensile stress load is a kind of more conservative estimation for soil strength, need change in the geotechnical engineering design in the present age
Into.
In addition, the damage of soil body mode encountered in Practical Project is mainly shown as failure by shear, such as landslide and foundation soil are lost
It is steady etc..However, the soil body there is a phenomenon where pulling damage and occurs that crack is also very common under action of pulling stress, such as side slope rear
Tensioning crack, core of earth-rockfill dam are in the drawing crack destruction under soil crowning appearance, the crack phenomenon that the soil body occurs in dry environment, ground fissure
Development etc., some iron tower of power transmission line and wind tower also easily cause the periphery soil body under horizontal loads that tensioning occurs are broken
It is bad.The presence in crack can greatly destroy the integrality of soil structures, weaken mechanical property, reduce stability, increase permeability, add
Play evaporation, aggravates slope surface soil erosion and weathering etc., brings series of negative to influence to geotechnical engineering and environmental geotechnical.Soil
Why body there is tensioning crack, is because tension stress has been more than the tensile strength of the soil body itself.Therefore, soil body tensioning is monitored
Stress, strain variation rule in dehiscence process, measure its tensile strength, system grasps the pulling damage of the soil body on this basis
Mechanism, prevention soil-body landslide have important engineering significance, and the prevention and treatment that can effectively improve related geological disaster is horizontal, save a large amount of
Manpower and material resources.
Since the tensioning mechanical characteristic past of the soil body carries no weight always in geotechnical engineering field, research report is relatively
Few, domestic even more rarely seen, existing some soil body tensile strength test methods are to have used for reference other materials such as rock, concrete mostly
Material field.The test method of soil body tensile strength can be divided into direct method and indirect method two major classes, and direct method is divided into again to be uniaxially stretched
And triaxial extension test, indirect method mainly include native beam deflection test, axial crushing test, radial crushing test and air pressure splitting
Test 4 kinds of modes.It is uniaxially stretched to apply to draw to sample under no lateral confinement and condition of triaxial stress respectively with triaxial extension test and answer
Power measures peak tensile stress directly to obtain tensile strength.Indirect method is based on certain theoretical hypothesis, with pressure break, bending etc.
Mode is tested, and obtains tensile strength finally by corresponding theoretical formula method.It can go out relative in three point bending test
The problems in existing stress collection, in the four-point bending test of Tu Liang, the moment of flexure that the soil body is subject to is constant between load point, because
The distribution of this tensile stress is relatively uniform, is a kind of ideal test method.In these trials, tensile stress can pass through certain hand
Section obtains, but the acquisition of soil body strain information faces many challenges.Because straining being unevenly distributed along draw direction, and exist
Many uncertainties, general tensioning strain can concentrate near failure mechanics, but can only using traditional displacement monitoring method
The mean strain for calculating sample, differs greatly with truth.If selecting common resistance strain gage in civil engineering, again
In the presence of being difficult to the problems such as installing, is big to soil disturbance in situ.Just because of the blank of soil body strain monitoring technology, lead to current people
It is unclear to soil body tension stress-strain constitutive relation understanding, seriously constrain the theoretical research and engineering practice in the field.
Distributed optical fiber sensing (DFOS) technology is quickly grown in recent years, and opening in materials such as detection concrete, pitches
Some successful applications have been obtained in splitting.By quasi-distributed optical fiber Bragg grating (FBG), full distributed Brillouin light time domain
The monitoring technology such as (BOTDR) and Brillouin optical time domain analysis (BOTDA) are reflected, can be obtained automatically along whole fiber length
The distribution situation of the monitoring informations such as upper strain, temperature.But it is limited to monitoring accuracy (generally tens microstrains), spatial discrimination
Rate (generally meter level) and sampling time (generally requiring more than ten minutes to dozens of minutes), the technology is never in soil-body landslide
It is well used in monitoring.And OFDR (Optical Frequency Domain Reflectometer) technology is in recent years
Start one the risen tip sensing technology with grade spatial resolution, 1 microstrain precision.With other monitoring methods
Compare, OFDR have data collection capacity is big, signal-to-noise ratio is high, the sampling interval is small, acquired results precision is high, be suitble to long distance monitoring and
The advantages that high frequency acquires, so having broad application prospects in soil body crack in tension fields of measurement.
Some researchers attempt to be embedded to straining and sensing optical fiber in the soil body to be monitored both at home and abroad recently, are based on Fibre Optical Sensor
Data carry out the deformation behaviour of analytical soil sample, or monitor its whether dry shrinkage and cracking.These researchs are not due to using special, standard
Change, integrated test equipment, is unable to control entire test process and boundary condition, therefore can only obtain some qualitative knots
By little to engineering reference significance.Since test period is long, optical fiber reading is also influenced by environment temperature, humidity etc., analysis knot
The reliability of fruit is poor.In addition, this method of direct-burried is more convenient in construction, but between the soil body and straining and sensing optical fiber
Interaction mechanism and compatible deformation problem not can guarantee, the setting of selection and anchor point simultaneously for straining and sensing optical fiber
There is no a scientific basis, thus fibre strain monitoring result it is effective whether there is very big uncertainty, largely restrict
Popularization and application of the technology in engineering.Based on OFDR technology, Light deformation can be carried out during soil-body landslide high-precision
The monitoring of degree, high spatial resolution, and feature is coordinated to the interface deformation between the soil body and straining and sensing optical fiber and is refined
Analysis advanced optimizes sensor installation technics on this basis, improves monitoring reliability.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of soil body tensioning mechanical characteristic light based on OFDR
Fibre monitoring and test method and device.
Present invention employs following technical solutions: a kind of soil body tensioning mechanical characteristic fiber-optic monitoring based on OFDR and test
Device, including test Tu Liang, tester, straining and sensing optical fiber；The tester includes casing, counter-force bracket, load
Plate, speed-adjustable driving device, the demodulation of OFDR signal and processing module, digital image acquisition and analytical equipment, the casing
Inside is equipped with speed-adjustable driving device, and speed-adjustable driving device is connect with dynamometer and load plate, and load plate can be along casing
Inner wall vertical direction moves up and down, and test Tu Liang is placed between load plate and counter-force bracket, straining and sensing optical fiber is along level side
To test Tu Liang is passed through, straining and sensing optical fiber is demodulated with OFDR signal by signal transmission fiber and is connected to processing module, number
The test observation face of Image Acquisition test Tu Liang corresponding with the digital image acquisition window of analytical equipment.
Speed-adjustable driving device includes stepper motor, gearbox.
Digital image acquisition and analytical equipment include high-speed camera and computer.
The load board ends are equipped with idler wheel.
A method of soil body tensioning mechanical characteristic fiber-optic monitoring and test device based on OFDR being used, including step is such as
Under:
Preparation test Tu Liang: the first step according to given dry density layering compacting Tu Liang in native beam compacting tool set, works as soil
When beam is pressed into the installation position of straining and sensing optical fiber, straining and sensing optical fiber is sequentially passed through into native beam compacting tool set body side light
Fine through hole is laid in the soil body, and the appropriate weight that hangs is at slight tension state, then proceed to according to it is given do it is close
Spend compacting of banketing；
Second step marks soil sample: the Tu Liang that compacting is finished takes out, and in test observation face, intensively pricks lower pinhole, and with this
As native beam surface texture, then the moisture content needed, overlay film are arrived in natural air drying or drying；
Third step, the demodulation of connection OFDR signal and processing module: native beam overlay film is opened, the load plate of tester is horizontally placed on
On, all straining and sensing optical fiber are connected with each other by the way of in parallel or series and are followed by the demodulation of OFDR signal and processing module
Interface on；
4th step starts to test: successively opening the demodulation of OFDR signal and fills with processing module, digital image acquisition and analysis
It sets, the switch of speed-adjustable driving device, speed-adjustable driving device pushes load plate to move downward with setting speed, and test Tu Liang is sent out therewith
Raw four-point bending；The demodulation of OFDR signal obtains in real time with processing module and the strain distribution state inside native beam is presented；Digitized map
As the texture variations on the surface collection and analysis device real-time tracing Tu Liang, the deformed strain field of native beam stress and displacement are obtained
?；
Data processing: 5th step is based on measured data, establishes soil body tension stress-strain constitutive relation, obtain the soil body
Tensile strength and cracking strain value parameter.
The digital image acquisition is acquired with analytical equipment based on digital picture coherent method or particle image velocimetry method
With analysis.
The OFDR signal demodulation can be required according to measuring accuracy and denoising etc. in 1mm-10cm with processing module
In the range of custom resolution.
The native beam compacting tool set is formed by fixing 4 blocks of side plates on one piece of bottom plate, and two pieces of side panels of both ends of them are opened
If optical fiber through hole.
The straining and sensing optical fiber carries out threaded processing to sheath by electrode engraving and Discharge Processing Technology.
The straining and sensing optical fiber is fixed in the soil body using tubular type or board-like anchor.
The utility model has the advantages that using the soil body tensioning mechanical characteristic fiber-optic monitoring of the invention based on OFDR and test method and dress
Set, can during real-time monitoring four-point bending test the craze and transfiguration information and tension and compression strain of the surface Tu Liang and inside when
Empty Evolution measures the tensile strength of the soil body under the conditions of different water cut, dry density etc., grasps soil body tension on this basis
Plastic-elastic stress afterwards-strain constitutive relation has the advantages such as economic and reliable, accurate, the degree of automation height of test.
Detailed description of the invention
Fig. 1 is in the soil body tensioning mechanical characteristic fiber-optic monitoring and test method for the preferred embodiment that the present invention is
Schematic device.
Including: the demodulation of 1.OFDR signal and processing module, 2. signal transmission fibers, 3. straining and sensing optical fiber, 4. examinations
Test soil sample, 5. load plates, 6. gearboxes, 7. stepper motors, 8. video cameras, 9. computers, 10, native beam compacting tool set, 11. optical fiber
Through hole, 12. casings, 13. counter-force brackets, 14. testers, 15. digital image acquisitions and analytical equipment, 16. dynamometers.
Fig. 2 is the digital image acquisition and analytical equipment structural schematic diagram of one embodiment of the invention.
Fig. 3 is native beam compacting tool set schematic diagram.
Fig. 4 is that strain optical fiber diagram of strains along its length is measured using the application method of one embodiment of the invention.
Fig. 5 is the comparison diagram that optical fiber measures strain and PIV measures strain.
Fig. 6 is measured during four-point bending using the application method of one embodiment of the invention at native beam bottom midpoint PIV
Manage result.
Fig. 7 is the record result using the application method typical cracking states several to the soil body of one embodiment of the invention.
Fig. 8 is the soil body under the conditions of the different water cut measured using the application method of one embodiment of the invention and dry density
Tensile strength variation diagram.
Specific embodiment
The present invention is more specifically described with preferred embodiment with reference to the accompanying drawing.
A kind of soil body tensioning mechanical characteristic fiber-optic monitoring and test method based on OFDR, comprises the following steps that
The first step, preparation test Tu Liang.According to given dry density layering compacting Tu Liang in native beam compacting tool set, work as soil
When beam is pressed into the installation position of straining and sensing optical fiber, straining and sensing optical fiber is sequentially passed through into native beam compacting tool set body side light
Fine through hole is laid in the soil body, and the appropriate weight that hangs is at slight tension state.
Second step marks soil sample.The Tu Liang that compacting is finished takes out, and in test observation face, uses diameter for the steel of 0.1mm
Needle intensively pricks lower pinhole, and in this, as native beam surface texture.Then natural air drying (or drying) is to the moisture content needed, by it
Overlay film；
Third step is opened native beam overlay film, is horizontally placed in the load plate of tester, and all straining and sensing optical fiber are used
Mode in parallel or series, which is connected with each other, to be followed by OFDR signal demodulating on the interface with processing module.
4th step starts to test.The demodulation of OFDR signal is successively opened to fill with processing module, digital image acquisition and analysis
It sets, the switch of stepper motor and gearbox, stepper motor pushes load plate to move downward with specific speed, and Tu Liang occurs four therewith
Point bending；The demodulation of OFDR signal obtains in real time with processing module and the strain distribution state inside native beam is presented；Digital picture is adopted
The texture variations of collection and the surface analytical equipment real-time tracing Tu Liang obtain the deformed strain field of native beam stress and displacement field.
5th step is based on measured data, establishes soil body tension stress-strain constitutive relation, obtain the tensile strength of the soil body
And cracking strain value.
The digital image processing system is based on digital picture coherent method or particle image velocimetry method.
The OFDR signal demodulation and processing module include optical fibre interrogation instrument, terminal calculation processing and visualization system.
Wherein, OFDR signal demodulation can require the model in 1mm-10cm with processing module according to measuring accuracy and denoising etc.
Enclose interior custom resolution.
For the device in the soil body tensioning mechanical characteristic fiber-optic monitoring and test method, including native beam compacting tool set
10, tester 14, straining and sensing optical fiber 3；The native beam compacting tool set 10 is by the mutual build-in of 5 blocks of steel plates, assembled；Side
It is attached between 4 blocks of plates using bolt, then whole build-in is connected in the notch of bottom plate, and through bolt with bottom plate, wherein
Two pieces of side panels are provided with small sircle hole 11；The straining and sensing optical fiber 3 horizontally passes through native beam compacting tool set 10 and is layed in native beam 4
In；The tester 14 is mainly believed by counter-force bracket 13, casing 12, load plate 5, stepper motor 7, gearbox 6, OFDR
Number demodulation is formed with processing module 1, digital image acquisition and analytical equipment 15.The stepper motor 7 adjusted by gearbox 6 and survey
Power meter (16) connection, pushes both ends to move down with the load plate 5 of ball along the inner wall of casing 12.The OFDR letter
Number demodulation connect acquisition soil 4 internal strain data of beam in real time with the straining and sensing optical fiber 3 in native beam 4 with processing module 1, and real-time
Showing the parameters such as light wave amount and native beam strength, the digital image acquisition and analytical equipment 15 are set to the front and back of tester 14,
By identifying 4 texture of native beam, the change in location on 4 surface of the native beam of tracking obtains the deformed strain field of native beam stress and displacement field,
And fibre strain data are demarcated or verified.The digital image acquisition and analytical equipment include high pixel digital camera with
Computer.The loading system includes stepper motor, gearbox, load plate；The straining and sensing optical fiber is carved by electrode
It carves and Discharge Processing Technology carries out screw thread processing to its sheath；The straining and sensing optical fiber uses heat-shrink tube and roundlet sheet mode
It is anchored at the compatibility of deformation for guaranteeing straining and sensing optical fiber and the soil body in the soil body.
As advanced optimizing for above scheme, the rigid side walls for forming native beam compacting tool set 10 are equipped with optical fiber through hole
11 protect it by electrode engraving and Discharge Processing Technology for the optical fiber across lateral arrangement, the straining and sensing optical fiber 3
Set carries out threaded processing；The OFDR signal demodulation can be required with processing module according to measuring accuracy and denoising etc.
Custom resolution in the range of 1mm-10cm.
Further, the digital image acquisition and analytical equipment 15 further include:
(1) textured test soil beam 4 is marked；In test observation face, diameter is used intensively to prick knit stitch for the steel needle of 0.1mm
Hole, and in this, as native 4 surface texture of beam；
(2) high pixel camera 8；The high pixel camera is placed in front of test Tu Liang (4), by identifying Tu Liang (4) texture,
The change in location for tracking native 4 surface of beam, obtains the deformed strain field of native beam stress and displacement field, and to fibre strain data into
Rower is fixed or verifies.；
(3) digital imaging processing software；The digital imaging processing software is based on digital picture coherent method (Digital
Image Correlation, abbreviation DIC) or particle image velocimetry method (Particle Image Velocimetry, referred to as
PIV) etc..
Embodiment
As depicted in figs. 1 and 2, a kind of soil body tensioning mechanical characteristic fiber-optic monitoring and test device based on OFDR, it is wrapped
Include native beam compacting tool set 10, tester 14, straining and sensing optical fiber 3；The native beam compacting tool set 10 is mutually embedding by 5 blocks of steel plates
Solid, it is assembled；It is attached between the plate of 4 blocks of side using bolt, then whole build-in is in the notch of bottom plate, and passes through bolt
It is connected with bottom plate, wherein two pieces of side panels are provided with small sircle hole 11；The straining and sensing optical fiber 3 horizontally passes through native beam pressing die
Tool 10 is layed in native beam 4；The tester 14 is mainly by counter-force bracket 13, casing 12, load plate 5, stepper motor
7, gearbox 6, the demodulation of OFDR signal are formed with processing module 1, digital image acquisition and analytical equipment 15, the OFDR signal
It demodulates to connect with processing module 1 with the straining and sensing optical fiber 3 in native beam 4 and acquires 4 internal strain data of native beam in real time, and show in real time
Show the parameters such as light wave amount and native beam strength, the digital image acquisition and analytical equipment 15 are set to the front and back of tester 14, lead to
Identification 4 texture of native beam is crossed, the change in location on 4 surface of native beam is tracked, obtains the deformed strain field of native beam stress and displacement field, and
Fibre strain data are demarcated or verified.
The rigid side walls for forming native beam compacting tool set 10 are equipped with optical fiber through hole 11 and are used for across lateral arrangement
Optical fiber；The straining and sensing optical fiber 3 carries out screw thread processing to its sheath by electrode engraving and Discharge Processing Technology；Described
The demodulation of OFDR signal can require customized in the range of 1mm-10cm with processing module according to measuring accuracy and denoising etc.
Resolution ratio.The digital image acquisition and analytical equipment further include: (1) mark textured test Tu Liang；In test observation face,
Diameter is used intensively to prick lower pinhole for the steel needle of 0.1mm, and in this, as native beam surface texture；(2) high pixel camera；The height
Pixel camera is placed in front of the native beam of test, by identifying native beam texture, is tracked the change in location on the surface Tu Liang, is obtained native beam stress
Deformed strain field and displacement field, and fibre strain data are demarcated or verified；(3) digital imaging processing software；Institute
It states digital imaging processing software and is based on digital picture coherent method (Digital Image Correlation, abbreviation DIC) or particle
Imaging velocimetry (Particle Image Velocimetry, abbreviation PIV) etc..
The test method of above-mentioned soil body tensioning mechanical characteristic fiber-optic monitoring provided in this embodiment and test device includes step
It is rapid as follows:
1) native beam 4 is tested in preparation.According to given dry density layering compacting Tu Liang, Dang Tuliang in native beam compacting tool set 10
When being pressed into the installation position of straining and sensing optical fiber 3, straining and sensing optical fiber is sequentially passed through into native 10 body side of beam compacting tool set
Optical fiber through hole 11 is laid in the soil body, and the appropriate weight that hangs is at slight tension state.
2) soil sample is marked.The Tu Liang that compacting is finished takes out, and in test observation face, uses diameter close for the steel needle of 0.1mm
Collection pricks lower pinhole, and in this, as native beam surface texture.Then natural air drying (or drying) is covered to the moisture content needed
Film；
3) native beam overlay film is opened, is horizontally placed in the load plate 5 of tester, all straining and sensing optical fiber (3) are used
Mode in parallel or series, which is connected with each other, to be followed by OFDR signal demodulating on the interface with processing module 1.
4) start to test.Successively open OFDR signal demodulation with processing module 1, digital image acquisition and analytical equipment 15,
The switch of stepper motor 7, gearbox 6, stepper motor 7 push load plate 5 to move downward with specific speed, and native beam 4 occurs therewith
Four-point bending；The demodulation of OFDR signal obtains in real time with processing module 1 and the strain distribution state inside native beam 4 is presented；Digitized map
As the texture variations on 15 surface real-time tracing Tu Liang of collection and analysis device, the deformed strain field of native beam stress and displacement are obtained
?.
5) it is based on measured data, soil body tension stress-strain constitutive relation is established, obtains the tensile strength and cracking of the soil body
Strain value.Specifically, cracking strain show that tensile strength is counted in combination with dynamometry and obtained by fiber-optic monitoring data: by dynamometry
Meter reading makes F-t curve, and determines that soil body tension stress F finally approaches stable soil body tension stress value F0, to deserved
To moment M0, byCalculate to obtain tensile strength sigmat, wherein I is the moment of inertia of Tu Liang, and h is native depth of beam, and t is the time.
The soil body tensioning mechanical characteristic fiber-optic monitoring and test device of the present embodiment configure aqueous first when specifically used
The soft kaolin that rate is 32%, then with native beam compacting tool set 10 (size length × width × height is 50cm × 15cm × 15cm) point
It is laminated real (averag density 1.87g/cm3).6 straining and sensings are horizontally mounted in three layer two of native beam inner part column in pressing process
Optical fiber (3) (OF1-1, OF1-2, OF2-1, OF2-1, OF3-1, OF3-2), fiber distance soil soffit height is respectively 3cm
(OF1-1, OF1-2), 6cm (OF2-1, OF2-1), 9cm (OF3-1, OF3-2), horizontal spacing 5cm.The soil that compacting is finished
Beam takes out, and in test observation face, diameter is used intensively to prick lower pinhole for the steel needle of 0.1mm, and in this, as native beam surface texture.
The Tu Liang prepared is put on 5 corresponding position of load plate, 6 straining and sensing optical fiber 3 are then connected to OFDR signal solution respectively
Tune and 1 interface of processing module are successively opened the demodulation of OFDR signal and processing module 1, digital image acquisition and analytical equipment 15, are walked
Into motor 7, the switch of gearbox 6.Stepper motor 7 pushes load plate 5 to push load plate 5 to moving down with the speed of 0.28mm/min
Dynamic, four-point bending takes place in Tu Liang, and the demodulation of OFDR signal, which is obtained and presented in real time with processing module 1, answers variation inside native beam
Cloth state；The texture variations of digital image acquisition and 15 surface real-time tracing Tu Liang of analytical equipment, and pass through built-in PIV number
Image processing software obtains the deformed strain field of native beam stress and displacement field；OFDR signal demodulation simultaneously is gone back with processing module 1
The strain time history curve of the different parts soil body under monitoring has obtained sample during four-point bending.
It should be noted that in addition to the implementation, the invention patent can also have other embodiment.All use is equal
The technical solution that replacement or equivalent transformation are formed, all falls in the protection scope that the invention patent requires.
Claims (10)
1. a kind of soil body tensioning mechanical characteristic fiber-optic monitoring and test device based on OFDR, which is characterized in that including test soil
Beam (4), tester (14), straining and sensing optical fiber (3)；The tester (14) includes casing (12), counter-force bracket
(13), load plate (5), speed-adjustable driving device, the demodulation of OFDR signal and processing module (1), digital image acquisition and analytical equipment
(15), speed-adjustable driving device, speed-adjustable driving device and dynamometer (16) and load plate are equipped with inside the casing (12)
(5) it connects, load plate (5) can be moved up and down along the inner wall vertical direction of casing (12), in dynamometer (16) and counter-force
Test Tu Liang (4) is placed between bracket (13), straining and sensing optical fiber (3) horizontally passes through test Tu Liang (4), straining and sensing
Optical fiber (3) is demodulated with OFDR signal by signal transmission fiber (2) and is connected to processing module (1), digital image acquisition and analysis
The test observation face of corresponding test Tu Liang (4) of the digital image acquisition window of device (15).
2. the soil body tensioning mechanical characteristic fiber-optic monitoring and test device according to claim 1 based on OFDR, feature
It is, speed-adjustable driving device includes stepper motor (7), gearbox (6).
3. the soil body tensioning mechanical characteristic fiber-optic monitoring and test device according to claim 1 based on OFDR, feature
It is, digital image acquisition and analytical equipment (15) include high-speed camera (8) and computer (9).
4. the soil body tensioning mechanical characteristic fiber-optic monitoring and test device according to claim 1 based on OFDR, feature
It is, the load plate (5) both ends are equipped with idler wheel.
5. soil body tensioning mechanical characteristic fiber-optic monitoring according to claim 1 and test device, which is characterized in that described
Signal demodulation and processing module include optical fibre interrogation instrument, terminal calculation processing and visualization system.
6. a kind of using any described soil body tensioning mechanical characteristic fiber-optic monitoring and test based on OFDR of Claims 1 to 5
The method of device, which is characterized in that comprise the following steps that
The first step, preparation test Tu Liang: according to given dry density layering compacting Tu Liang in native beam compacting tool set, when Tu Liang is pressed
When making the installation position of straining and sensing optical fiber, straining and sensing optical fiber is sequentially passed through into native beam compacting tool set body side optical fiber and is worn
Open-work is laid in the soil body, and the appropriate weight that hangs is at slight tension state, then proceedes to be filled out according to given dry density
Soil pressure system；
Second step marks soil sample: the Tu Liang that finishes of compacting taken out, in test observation face, intensively pricks lower pinhole, and in this, as
Native beam surface texture, then the moisture content needed, overlay film are arrived in natural air drying or drying；
Third step, the demodulation of connection OFDR signal and processing module: opening native beam overlay film, be horizontally placed in the load plate of tester, will
All straining and sensing optical fiber are connected with each other by the way of in parallel or series to be followed by OFDR signal demodulating connecing with processing module
On mouth；
4th step starts to test: successively opening the demodulation of OFDR signal and processing module, digital image acquisition and analytical equipment, tune
The switch of fast driving device, speed-adjustable driving device push load plate to move downward with setting speed, and test Tu Liang occurs four therewith
Point bending；The demodulation of OFDR signal obtains in real time with processing module and the strain distribution state inside native beam is presented；Digital picture is adopted
The texture variations of collection and the surface analytical equipment real-time tracing Tu Liang obtain the deformed strain field of native beam stress and displacement field；
Data processing: 5th step is based on measured data, establishes soil body tension stress-strain constitutive relation, obtain the tension of the soil body
Intensity and cracking strain value parameter.
7. the side according to claim 6 using the soil body tensioning mechanical characteristic fiber-optic monitoring and test device based on OFDR
Method, which is characterized in that the digital image acquisition and analytical equipment is based on digital picture coherent method or particle image velocimetry method
To acquire and analyze.
8. the side according to claim 6 using the soil body tensioning mechanical characteristic fiber-optic monitoring and test device based on OFDR
Method, which is characterized in that the native beam compacting tool set (10) is formed by fixing 4 blocks of side plates on one piece of bottom plate, and the two of both ends of them
Block side panel opens up optical fiber through hole (11).
9. the side according to claim 6 using the soil body tensioning mechanical characteristic fiber-optic monitoring and test device based on OFDR
Method, which is characterized in that the straining and sensing optical fiber carries out threaded place to sheath by electrode engraving and Discharge Processing Technology
Reason, the straining and sensing optical fiber are fixed in the soil body using tubular type or board-like anchor.
10. the soil body tensioning mechanical characteristic fiber-optic monitoring and test device according to claim 6 using based on OFDR
Method, which is characterized in that the OFDR signal demodulation and processing module are required according to measuring accuracy and denoising in 1mm-
Custom resolution in the range of 10cm.
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| CN113959838B (en) * | 2021-09-15 | 2024-03-29 | 深圳市比洋光通信科技股份有限公司 | Method for monitoring stress of optical fiber capillary tube |
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